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Transportation and Climate Change Clearinghouse

Impact Forecasts

Washington DC Statistics

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Increase in Eustatic SLR 6 cm 6.5 cm
Regular
Inundation
At-Risk Total Regular
Inundation
At-Risk Total
Length Km % Affected Km % Affected Km % Affected Km % Affected Km % Affected Km % Affected
Interstates 0.0 0% 0.5 2% 0.5 2% 0.0 0% 0.5 2% 0.5 2%
Non-Interstate Principal Arterials 0.0 0% 5.1 3% 5.1 3% 0.0 0% 5.1 3% 5.2 3%
Minor Arterials 0.0 0% 0.0 0% 0.0 0% 0.0 0% 0.0 0% 0.0 0%
National Highway System (NHS) 0.0 0% 4.4 3% 4.4 3% 0.0 0% 4.4 3% 4.4 3%
Rails 0.0 0% 1.9 2% 1.9 3% 0.0 0% 1.9 2% 2.0 3%
Area Acres % Affected Acres % Affected Acres % Affected Acres % Affected Acres % Affected Acres % Affected
Ports 0 0% 0 0% 0 0% 0 0% 0 0% 0 0%
Airport Property 0 0% 0 0% 0 0% 0 0% 0 0% 0 0%
Airport Runways 0 0% 0 0% 0 0% 0 0% 0 0% 0 0%
Total Land Area Affected 12 0% 1,721 4% 1,733 4% 12 0% 1,731 4% 1,743 4%


Increase in Eustatic SLR 13 cm 17.5 cm
Regular
Inundation
At-Risk Total Regular
Inundation
At-Risk Total
Length Km % Affected Km % Affected Km % Affected Km % Affected Km % Affected Km % Affected
Interstates 0.0 0% 0.5 2% 0.5 2% 0.0 0% 0.5 2% 0.5 2%
Non-Interstate Principal Arterials 0.0 0% 5.4 3% 5.5 3% 0.0 0% 5.6 3% 5.6 3%
Minor Arterials 0.0 0% 0.0 0% 0.0 0% 0.0 0% 0.0 0% 0.0 0%
National Highway System (NHS) 0.0 0% 4.7 4% 4.7 4% 0.0 0% 4.9 4% 4.9 4%
Rails 0.0 0% 2.3 3% 2.3 3% 0.1 0% 2.4 3% 2.4 3%
Area Acres % Affected Acres % Affected Acres % Affected Acres % Affected Acres % Affected Acres % Affected
Ports 0 0% 0 0% 0 0% 0 0% 0 0% 0 0%
Airport Property 0 0% 0 0% 0 0% 0 0% 0 0% 0 0%
Airport Runways 0 0% 0 0% 0 0% 0 0% 0 0% 0 0%
Total Land Area Affected 14 0% 1,841 5% 1,855 5% 16 0% 1,912 5% 1,928 5%


Increase in Eustatic SLR 21 cm 31 cm
Regular
Inundation
At-Risk Total Regular
Inundation
At-Risk Total
Length Km % Affected Km % Affected Km % Affected Km % Affected Km % Affected Km % Affected
Interstates 0.0 0% 0.6 3% 0.6 3% 0.0 0% 0.7 3% 0.7 3%
Non-Interstate Principal Arterials 0.0 0% 5.8 3% 5.8 3% 0.0 0% 6.3 4% 6.4 4%
Minor Arterials 0.0 0% 0.0 0% 0.0 0% 0.0 0% 0.0 0% 0.0 0%
National Highway System (NHS) 0.0 0% 5.1 4% 5.1 4% 0.0 0% 5.6 4% 5.6 4%
Rails 0.1 0% 2.5 3% 2.5 3% 0.1 0% 2.8 4% 2.8 4%
Area Acres % Affected Acres % Affected Acres % Affected Acres % Affected Acres % Affected Acres % Affected
Ports 0 0% 0 0% 0 0% 0 0% 0 0% 0 0%
Airport Property 0 0% 0 0% 0 0% 0 0% 0 0% 0 0%
Airport Runways 0 0% 0 0% 0 0% 0 0% 0 0% 0 0%
Total Land Area Affected 17 0% 1,962 5% 1,979 5% 21 0% 2,082 5% 2,103 5%


Increase in Eustatic SLR 30 cm 48.5 cm
Regular
Inundation
At-Risk Total Regular
Inundation
At-Risk Total
Length Km % Affected Km % Affected Km % Affected Km % Affected Km % Affected Km % Affected
Interstates 0.0 0% 0.7 3% 0.7 3% 0.0 0% 1.0 4% 1.0 4%
Non-Interstate Principal Arterials 0.0 0% 6.3 4% 6.3 4% 0.1 0% 7.1 4% 7.2 4%
Minor Arterials 0.0 0% 0.0 0% 0.0 0% 0.0 0% 0.0 0% 0.0 0%
National Highway System (NHS) 0.0 0% 5.6 4% 5.6 4% 0.0 0% 6.5 5% 6.5 5%
Rails 0.1 0% 2.7 4% 2.8 4% 0.1 0% 3.4 4% 3.4 4%
Area Acres % Affected Acres % Affected Acres % Affected Acres % Affected Acres % Affected Acres % Affected
Ports 0 0% 0 0% 0 0% 0 0% 0 0% 0 0%
Airport Property 0 0% 0 0% 0 0% 0 0% 0 0% 0 0%
Airport Runways 0 0% 0 0% 0 0% 0 0% 0 0% 0 0%
Total Land Area Affected 20 0% 2,071 5% 2,092 5% 28 0% 2,257 6% 2,285 6%


Increase in Eustatic SLR 59 cm
Regular
Inundation
At-Risk Total
Length Km % Affected Km % Affected Km % Affected
Interstates 0.0 0% 1.2 5% 1.2 5%
Non-Interstate Principal Arterials 0.1 0% 7.7 4% 7.8 4%
Minor Arterials 0.0 0% 0.0 0% 0.0 0%
National Highway System (NHS) 0.0 0% 7.1 5% 7.1 5%
Rails 0.1 0% 3.7 5% 3.8 5%
Area Acres % Affected Acres % Affected Acres % Affected
Ports 0 0% 0 0% 0 0%
Airport Property 0 0% 0 0% 0 0%
Airport Runways 0 0% 0 0% 0 0%
Total Land Area Affected 33 0% 2,359 6% 2,392 6%



1. Sources: Interstates, Non-Interstate Principal Arterials, Minor Arterials, and NHS - National Highway Planning Network (NHPN). Rails - Federal Railroad Administration.
Ports - Digitized from Digital Orthophoto Quadrangles clipped to the mean high water line. Airport Property and Runways - Tele Atlas.
2. The NHPN includes all Interstates and other Principal Arterials, all Rural Minor Arterials, and a small portion of the Urban Minor Arterials, as well as the NHS.
3. This study includes the Rural Minor Arterials but not the Urban Minor Arterials. (There are no Rural Minor Arterials in DC.)
4. See section 3 of the "Study Goals and Methodologies" for an explanation of how these results were generated.
The results should not be understood as defining specific changes in water levels at precise points in time.
5. The Total column for each scenario includes the sum of Regular Inundation and At-Risk. The At-Risk column does not include Regularly Inundated data.

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